The invention relates to a mechanical type compact spinning method. A friction device is arranged above a sliver in a condensed area formed between a compact-ring-spinning-frame front-roller output jaw and a twisting triangular space, the distance between a frictional part on the surface of the friction device and a lattice apron is smaller than the thickness of the silver; in the spinning process, the friction device does continuous movement, the grooving direction of a condensed groove is located between the opposite direction of the movement direction of the friction device and the operation direction of the silver, the grooving direction of the condensed groove is the extending direction, from the groove end A to the groove end B, of the condensed groove, and the silver keeps close to the groove end A to the groove end B in sequence in the operation process. Compared with a traditional compact spinning method, required negative pressure gas flow is small, the energy consumption of compact spinning is greatly reduced, and the production cost is saved, due to the wrapping effect of outer-layer fibers, the spinning strength is high, the quality of spinning yarn is good, and the method has an extensive application prospect.